Question
The average of 10 numbers is 30. If one of the numbers
is excluded, the average of the remaining numbers becomes 28. Find the excluded number.Solution
Total sum of 10 numbers = 10 × 30 = 300. Total sum of 9 numbers = 9 × 28 = 252. Thus, the excluded number = 300 - 252 = 48.
More Average Questions
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What will come in place of the question mark (?) in the following series?
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11          20          ?             64          112        192
...Find the missing number in the given number series.
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